Real Madrid's squad depth is certainly better than Barcelona's in the previous El Clasico, but even so, Barcelona really went according to plan even though in the end they had to admit defeat in the last few minutes. Barcelona's performance was relatively good, but several tactical changes made Barcelona's game less good.
Although Real Madrid seems in a better condition, but they also have 2 main players who couldn't play in El Clasico (Courtois, Militao). We know that these players have a big role in Real Madrid squad. Luckily, Real Madrid already have the alternatives, they have Kepa to replace Courtois position and few defenders to replace Militao position. But Barcelona have more injured players, it becomes their main problem.
Barcelona played quite well in the first half, but they didn't play as expected in second half.